A Tape with VersatilityOriginally developed for heating, ventilating and air conditioning (HVAC) applications, duct tape is used today in a variety of maintenance, repair and construction settings. 3M Heavy Duty Duct Tape 3939 was tested according to UL723, ASTM E84. Due to its unique design, it is an excellent choice for general indoor application in MRO/construction. The tape can be used at temperatures as high as 200F for up to 30 minutes.3M Heavy Duty Duct Tape 3939 comes with a classic, silver-colored backing. The sturdy cloth-reinforced tape can be torn from the roll and sticks instantly, providing a wide range of convenient solutions.Recommended Applications Patching Bundling Reinforcing Tabbing Taping/splicing insulation Capping pipe Securing conduit ends Marking Labeling Temporary repair Hanging polyethylene drapes Protecting against light sandblast oversprayBuilt to Stick3M's family of rugged cloth and duct tapes adheres to most surfaces for applications ranging from bundling to moisture proofing, sealing to splicing, reinforcing to hanging poly drapes. Available in a variety of colors and strengths, they're known best for their hand tearability, high tensile strength and conformability.